Tuesday, 3 February 2015

Update xml file with foreach in C#



hi I have a xml file like bellow :



<page>
    <DOC>
    <DOCID>1</DOCID>
    <CAT>news</CAT>
    <DATE>2015</DATE>
    <CAT>sport</CAT>
    <DOM>News</DOM>
    <LANG>ARabic</LANG>
    <AUT>author</AUT>
    <TITLE>title</TITLE>
    <BODY></BODY>
    </DOC>
    <DOC>
    <DOCID>1</DOCID>
    <CAT>news</CAT>
    <DATE>2015</DATE>
    <CAT>sport</CAT>
    <DOM>News</DOM>
    <LANG>ARabic</LANG>
    <AUT>author</AUT>
    <TITLE>title</TITLE>
    <BODY></BODY>
    </DOC>
    <DOC>
    <DOCID>1</DOCID>
    <CAT>news</CAT>
    <DATE>2015</DATE>
    <CAT>sport</CAT>
    <DOM>News</DOM>
    <LANG>ARabic</LANG>
    <AUT>author</AUT>
    <TITLE>title</TITLE>
    <BODY></BODY>
    </DOC>
</page>


How I can Update the second DOC node ? I want change some value for example change language to EN or ... I found it But it remove the firs node Under DOC node and add a node by name CAT



        XmlDocument xml = new XmlDocument();

        xml.Load(FileAddress);
        foreach (XmlElement element in xml.SelectNodes("//DOC"))
        {
            foreach (XmlElement element2 in element)
            {
                if (element.SelectSingleNode("//DOCID").InnerText == datas[PageNow].DOCID)
                {
                    XmlNode newvalue = xml.CreateElement("CAT");
                    newvalue.InnerText = "aaaaaaa";
                    element.ReplaceChild(newvalue, element2);
                    xml.Save(FileAddress);

                }
            }
        }

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